Eu2+ and Eu3+ co-activated LaAlO3 phosphor: synthesis and tuned luminescence

Abstract

Sr²⁺ and Si⁴⁺ ion doped LaAlO₃:Eu phosphors were synthesized through a high-temperature solid-state reaction route. Their phase component and photoluminescence properties were investigated. Under ultraviolet (UV) light excitation, the phosphors show simultaneously blue emission of the Eu²⁺ ion and orange-red emission of the Eu³⁺ ion. The relative emission intensity of both Eu²⁺ and Eu³⁺ ions can be tuned by changing the doping concentration of the Sr²⁺, Si⁴⁺ and Eu³⁺ ions. In contrast to the Sr²⁺ ion, the incorporation of Si⁴⁺ ion can effectively enhance the emission of Eu²⁺. The optimal doping concentration of the Eu³⁺ and Si⁴⁺ ions are about 0.02 and 0.03, respectively. The results indicate that the phosphor may be a potential candidate for white LED lighting applications.